Philosophy is traditionally divided into several branches. Metaphysics inquires into the nature and ultimate significance of the universe. Logic is concerned with the laws of valid reasoning. Epistemology investigates the nature of knowledge and the process of knowing. Ethics deals with problems of right conduct. Aesthetics attempts to determine the nature of beauty and the criteria of artistic judgment. Within metaphysics a division is made according to fundamental principles. The three major positions are idealism, which maintains that what is real is in the form of thought rather than matter; materialism, which considers matter and the motion of matter as the universal reality; and dualism, which gives thought and matter equal status. Naturalism and positivism are forms of materialism.
